Of Course!! I used to have that problem when I played long Csound demos -- overworking the Flt Pt processor yet untouched by human hands ... I don't know why I didn't relate the two situations.

Turned off power saving, and the problem immediately went away.
No, power saving doesn't turn off automatically when hdmi is plugged in. Perhaps it should ... Or at least we should have a warning distributed with the hdmi cable that the port will turn off after 15 seconds with power saving on.

Thanks all.
-- b

On 18/08/2013 5:26 p.m., Tom Parker wrote:
On 18/08/13 17:05, Barry Vercoe wrote:
OK, with tail -f ... messages, I do see a burst of messages and the
projector shows the exact screen.  But only for 15 seconds, when the
projector then goes blank and reverts to _No Signal_ until I touch
something on the XO like the screen, track pad or some key. Apparently
the XO has stopped sending hdmi signals, so the projector is reporting
exactly that.

When the display goes blank, does the power light start flashing to indicate the laptop has gone to sleep?

Try turning off power saving in the settings. When I was testing, the power saving automatically turned off when I plugged in an external display and turned on again when I unplugged it, but perhaps this isn't working on your laptop?

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